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Reid Spencer5f016e22007-07-11 17:01:13 +00001//===--- Sema.cpp - AST Builder and Semantic Analysis Implementation ------===//
2//
3// The LLVM Compiler Infrastructure
4//
Chris Lattner0bc735f2007-12-29 19:59:25 +00005// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
Reid Spencer5f016e22007-07-11 17:01:13 +00007//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the actions class which performs semantic analysis and
11// builds an AST out of a parse stream.
12//
13//===----------------------------------------------------------------------===//
14
John McCall9c3087b2010-08-26 02:13:20 +000015#include "clang/Sema/SemaInternal.h"
Anton Korobeynikov82d0a412010-01-10 12:58:08 +000016#include "TargetAttributesSema.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000017#include "clang/AST/ASTContext.h"
Douglas Gregor79a9a342010-02-09 22:26:47 +000018#include "clang/AST/ASTDiagnostic.h"
John McCall384aff82010-08-25 07:42:41 +000019#include "clang/AST/DeclCXX.h"
Daniel Jasperf8cc02e2012-06-06 08:32:04 +000020#include "clang/AST/DeclFriend.h"
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +000021#include "clang/AST/DeclObjC.h"
Daniel Dunbare91593e2008-08-11 04:54:23 +000022#include "clang/AST/Expr.h"
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +000023#include "clang/AST/ExprCXX.h"
Chris Lattnerad8dcf42011-02-17 07:39:24 +000024#include "clang/AST/StmtCXX.h"
Douglas Gregorf7572a62011-09-20 18:13:03 +000025#include "clang/Basic/FileManager.h"
Anders Carlsson91a0cc92009-08-26 22:33:56 +000026#include "clang/Basic/PartialDiagnostic.h"
Chris Lattner4d150c82009-04-30 06:18:40 +000027#include "clang/Basic/TargetInfo.h"
Chandler Carruth55fc8732012-12-04 09:13:33 +000028#include "clang/Lex/HeaderSearch.h"
29#include "clang/Lex/Preprocessor.h"
30#include "clang/Sema/CXXFieldCollector.h"
31#include "clang/Sema/DelayedDiagnostic.h"
32#include "clang/Sema/ExternalSemaSource.h"
33#include "clang/Sema/MultiplexExternalSemaSource.h"
34#include "clang/Sema/ObjCMethodList.h"
35#include "clang/Sema/PrettyDeclStackTrace.h"
36#include "clang/Sema/Scope.h"
37#include "clang/Sema/ScopeInfo.h"
38#include "clang/Sema/SemaConsumer.h"
39#include "clang/Sema/TemplateDeduction.h"
40#include "llvm/ADT/APFloat.h"
41#include "llvm/ADT/DenseMap.h"
42#include "llvm/ADT/SmallSet.h"
43#include "llvm/Support/CrashRecoveryContext.h"
Reid Spencer5f016e22007-07-11 17:01:13 +000044using namespace clang;
John McCall781472f2010-08-25 08:40:02 +000045using namespace sema;
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +000046
Argyrios Kyrtzidisea8c59a2012-01-17 02:15:51 +000047PrintingPolicy Sema::getPrintingPolicy(const ASTContext &Context,
48 const Preprocessor &PP) {
Douglas Gregor8987b232011-09-27 23:30:47 +000049 PrintingPolicy Policy = Context.getPrintingPolicy();
David Blaikie4e4d0842012-03-11 07:00:24 +000050 Policy.Bool = Context.getLangOpts().Bool;
Douglas Gregor8987b232011-09-27 23:30:47 +000051 if (!Policy.Bool) {
52 if (MacroInfo *BoolMacro = PP.getMacroInfo(&Context.Idents.get("bool"))) {
53 Policy.Bool = BoolMacro->isObjectLike() &&
54 BoolMacro->getNumTokens() == 1 &&
55 BoolMacro->getReplacementToken(0).is(tok::kw__Bool);
56 }
57 }
58
59 return Policy;
60}
61
Douglas Gregorc1a3e5e2010-08-25 18:07:12 +000062void Sema::ActOnTranslationUnitScope(Scope *S) {
Steve Naroffb216c882007-10-09 22:01:59 +000063 TUScope = S;
Douglas Gregor44b43212008-12-11 16:49:14 +000064 PushDeclContext(S, Context.getTranslationUnitDecl());
Mike Stump1eb44332009-09-09 15:08:12 +000065
John McCallc7e04da2010-05-28 18:45:08 +000066 VAListTagName = PP.getIdentifierInfo("__va_list_tag");
Steve Naroff3b950172007-10-10 21:53:07 +000067}
68
Douglas Gregorf807fe02009-04-14 16:27:31 +000069Sema::Sema(Preprocessor &pp, ASTContext &ctxt, ASTConsumer &consumer,
Douglas Gregor467dc882011-08-25 22:30:56 +000070 TranslationUnitKind TUKind,
Daniel Dunbar3a2838d2009-11-13 08:58:20 +000071 CodeCompleteConsumer *CodeCompleter)
Axel Naumann0ec56b72012-10-18 19:05:02 +000072 : TheTargetAttributesSema(0), ExternalSource(0),
73 isMultiplexExternalSource(false), FPFeatures(pp.getLangOpts()),
David Blaikie4e4d0842012-03-11 07:00:24 +000074 LangOpts(pp.getLangOpts()), PP(pp), Context(ctxt), Consumer(consumer),
Mike Stump1eb44332009-09-09 15:08:12 +000075 Diags(PP.getDiagnostics()), SourceMgr(PP.getSourceManager()),
Axel Naumann0ec56b72012-10-18 19:05:02 +000076 CollectStats(false), CodeCompleter(CodeCompleter),
Argyrios Kyrtzidis3a387442011-10-06 23:23:20 +000077 CurContext(0), OriginalLexicalContext(0),
78 PackContext(0), MSStructPragmaOn(false), VisContext(0),
Richard Smithe49ff3e2012-09-25 04:46:05 +000079 IsBuildingRecoveryCallExpr(false),
John McCall80ee6e82011-11-10 05:35:25 +000080 ExprNeedsCleanups(false), LateTemplateParser(0), OpaqueParser(0),
Sebastian Redl395e04d2012-01-17 22:49:33 +000081 IdResolver(pp), StdInitializerList(0), CXXTypeInfoDecl(0), MSVCGuidDecl(0),
Benjamin Kramer471131a2012-04-22 20:43:35 +000082 NSNumberDecl(0),
83 NSStringDecl(0), StringWithUTF8StringMethod(0),
84 NSArrayDecl(0), ArrayWithObjectsMethod(0),
Ted Kremenekebcb57a2012-03-06 20:05:56 +000085 NSDictionaryDecl(0), DictionaryWithObjectsMethod(0),
Bill Wendlingb7566d82010-09-08 21:30:16 +000086 GlobalNewDeleteDeclared(false),
Douglas Gregor467dc882011-08-25 22:30:56 +000087 TUKind(TUKind),
John McCall13489672012-05-07 06:16:58 +000088 NumSFINAEErrors(0), InFunctionDeclarator(0),
Douglas Gregor1eee5dc2011-01-27 22:31:44 +000089 AccessCheckingSFINAE(false), InNonInstantiationSFINAEContext(false),
Douglas Gregor8491ffe2010-12-20 22:05:00 +000090 NonInstantiationEntries(0), ArgumentPackSubstitutionIndex(-1),
91 CurrentInstantiationScope(0), TyposCorrected(0),
Bill Wendlingb7566d82010-09-08 21:30:16 +000092 AnalysisWarnings(*this)
Douglas Gregorf35f8282009-11-11 21:54:23 +000093{
Steve Naroff3b950172007-10-10 21:53:07 +000094 TUScope = 0;
Douglas Gregorcefc3af2012-04-16 07:05:22 +000095
Douglas Gregord8bba9c2011-06-28 16:20:02 +000096 LoadedExternalKnownNamespaces = false;
Ted Kremenekebcb57a2012-03-06 20:05:56 +000097 for (unsigned I = 0; I != NSAPI::NumNSNumberLiteralMethods; ++I)
98 NSNumberLiteralMethods[I] = 0;
99
David Blaikie4e4d0842012-03-11 07:00:24 +0000100 if (getLangOpts().ObjC1)
Ted Kremenekebcb57a2012-03-06 20:05:56 +0000101 NSAPIObj.reset(new NSAPI(Context));
102
David Blaikie4e4d0842012-03-11 07:00:24 +0000103 if (getLangOpts().CPlusPlus)
Argyrios Kyrtzidis07952322008-07-01 10:37:29 +0000104 FieldCollector.reset(new CXXFieldCollector());
Mike Stump1eb44332009-09-09 15:08:12 +0000105
Chris Lattner22caddc2008-11-23 09:13:29 +0000106 // Tell diagnostics how to render things from the AST library.
Douglas Gregor79a9a342010-02-09 22:26:47 +0000107 PP.getDiagnostics().SetArgToStringFn(&FormatASTNodeDiagnosticArgument,
108 &Context);
Douglas Gregor2afce722009-11-26 00:44:06 +0000109
110 ExprEvalContexts.push_back(
Richard Smith76f3f692012-02-22 02:04:18 +0000111 ExpressionEvaluationContextRecord(PotentiallyEvaluated, 0,
112 false, 0, false));
John McCall781472f2010-08-25 08:40:02 +0000113
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +0000114 FunctionScopes.push_back(new FunctionScopeInfo(Diags));
Douglas Gregor46ea32a2010-08-12 22:51:45 +0000115}
116
117void Sema::Initialize() {
118 // Tell the AST consumer about this Sema object.
119 Consumer.Initialize(Context);
120
121 // FIXME: Isn't this redundant with the initialization above?
122 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
123 SC->InitializeSema(*this);
124
125 // Tell the external Sema source about this Sema object.
126 if (ExternalSemaSource *ExternalSema
127 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
128 ExternalSema->InitializeSema(*this);
Douglas Gregor4dfd02a2011-08-12 05:46:01 +0000129
Douglas Gregor772eeae2011-08-12 06:49:56 +0000130 // Initialize predefined 128-bit integer types, if needed.
Richard Smith84268902012-11-29 05:41:51 +0000131 if (PP.getTargetInfo().hasInt128Type()) {
Douglas Gregor772eeae2011-08-12 06:49:56 +0000132 // If either of the 128-bit integer types are unavailable to name lookup,
133 // define them now.
134 DeclarationName Int128 = &Context.Idents.get("__int128_t");
Douglas Gregoreee242f2011-10-27 09:33:13 +0000135 if (IdResolver.begin(Int128) == IdResolver.end())
Douglas Gregor772eeae2011-08-12 06:49:56 +0000136 PushOnScopeChains(Context.getInt128Decl(), TUScope);
137
138 DeclarationName UInt128 = &Context.Idents.get("__uint128_t");
Douglas Gregoreee242f2011-10-27 09:33:13 +0000139 if (IdResolver.begin(UInt128) == IdResolver.end())
Douglas Gregor772eeae2011-08-12 06:49:56 +0000140 PushOnScopeChains(Context.getUInt128Decl(), TUScope);
141 }
142
143
Douglas Gregor4dfd02a2011-08-12 05:46:01 +0000144 // Initialize predefined Objective-C types:
David Blaikie4e4d0842012-03-11 07:00:24 +0000145 if (PP.getLangOpts().ObjC1) {
Douglas Gregor7a27ea52011-08-12 06:17:30 +0000146 // If 'SEL' does not yet refer to any declarations, make it refer to the
147 // predefined 'SEL'.
148 DeclarationName SEL = &Context.Idents.get("SEL");
Douglas Gregoreee242f2011-10-27 09:33:13 +0000149 if (IdResolver.begin(SEL) == IdResolver.end())
Douglas Gregor7a27ea52011-08-12 06:17:30 +0000150 PushOnScopeChains(Context.getObjCSelDecl(), TUScope);
151
Douglas Gregor4dfd02a2011-08-12 05:46:01 +0000152 // If 'id' does not yet refer to any declarations, make it refer to the
153 // predefined 'id'.
154 DeclarationName Id = &Context.Idents.get("id");
Douglas Gregoreee242f2011-10-27 09:33:13 +0000155 if (IdResolver.begin(Id) == IdResolver.end())
Douglas Gregor4dfd02a2011-08-12 05:46:01 +0000156 PushOnScopeChains(Context.getObjCIdDecl(), TUScope);
Douglas Gregor79d67262011-08-12 05:59:41 +0000157
158 // Create the built-in typedef for 'Class'.
159 DeclarationName Class = &Context.Idents.get("Class");
Douglas Gregoreee242f2011-10-27 09:33:13 +0000160 if (IdResolver.begin(Class) == IdResolver.end())
Douglas Gregor79d67262011-08-12 05:59:41 +0000161 PushOnScopeChains(Context.getObjCClassDecl(), TUScope);
Douglas Gregora6ea10e2012-01-17 18:09:05 +0000162
163 // Create the built-in forward declaratino for 'Protocol'.
164 DeclarationName Protocol = &Context.Idents.get("Protocol");
165 if (IdResolver.begin(Protocol) == IdResolver.end())
166 PushOnScopeChains(Context.getObjCProtocolDecl(), TUScope);
Douglas Gregor4dfd02a2011-08-12 05:46:01 +0000167 }
Meador Ingec5613b22012-06-16 03:34:49 +0000168
169 DeclarationName BuiltinVaList = &Context.Idents.get("__builtin_va_list");
170 if (IdResolver.begin(BuiltinVaList) == IdResolver.end())
171 PushOnScopeChains(Context.getBuiltinVaListDecl(), TUScope);
Reid Spencer5f016e22007-07-11 17:01:13 +0000172}
173
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000174Sema::~Sema() {
175 if (PackContext) FreePackedContext();
Eli Friedmanaa8b0d12010-08-05 06:57:20 +0000176 if (VisContext) FreeVisContext();
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000177 delete TheTargetAttributesSema;
Fariborz Jahanian62c92582011-04-25 18:49:15 +0000178 MSStructPragmaOn = false;
John McCall781472f2010-08-25 08:40:02 +0000179 // Kill all the active scopes.
180 for (unsigned I = 1, E = FunctionScopes.size(); I != E; ++I)
181 delete FunctionScopes[I];
182 if (FunctionScopes.size() == 1)
183 delete FunctionScopes[0];
Douglas Gregor46ea32a2010-08-12 22:51:45 +0000184
185 // Tell the SemaConsumer to forget about us; we're going out of scope.
186 if (SemaConsumer *SC = dyn_cast<SemaConsumer>(&Consumer))
187 SC->ForgetSema();
188
189 // Detach from the external Sema source.
190 if (ExternalSemaSource *ExternalSema
Douglas Gregor914ed9d2010-08-13 03:15:25 +0000191 = dyn_cast_or_null<ExternalSemaSource>(Context.getExternalSource()))
Douglas Gregor46ea32a2010-08-12 22:51:45 +0000192 ExternalSema->ForgetSema();
Axel Naumann0ec56b72012-10-18 19:05:02 +0000193
194 // If Sema's ExternalSource is the multiplexer - we own it.
195 if (isMultiplexExternalSource)
196 delete ExternalSource;
Anton Korobeynikov82d0a412010-01-10 12:58:08 +0000197}
198
John McCallf85e1932011-06-15 23:02:42 +0000199/// makeUnavailableInSystemHeader - There is an error in the current
200/// context. If we're still in a system header, and we can plausibly
201/// make the relevant declaration unavailable instead of erroring, do
202/// so and return true.
203bool Sema::makeUnavailableInSystemHeader(SourceLocation loc,
Chris Lattner5f9e2722011-07-23 10:55:15 +0000204 StringRef msg) {
John McCallf85e1932011-06-15 23:02:42 +0000205 // If we're not in a function, it's an error.
206 FunctionDecl *fn = dyn_cast<FunctionDecl>(CurContext);
207 if (!fn) return false;
208
209 // If we're in template instantiation, it's an error.
210 if (!ActiveTemplateInstantiations.empty())
211 return false;
212
213 // If that function's not in a system header, it's an error.
214 if (!Context.getSourceManager().isInSystemHeader(loc))
215 return false;
216
217 // If the function is already unavailable, it's not an error.
218 if (fn->hasAttr<UnavailableAttr>()) return true;
219
220 fn->addAttr(new (Context) UnavailableAttr(loc, Context, msg));
221 return true;
222}
223
Sebastian Redl58a2cd82011-04-24 16:28:06 +0000224ASTMutationListener *Sema::getASTMutationListener() const {
225 return getASTConsumer().GetASTMutationListener();
226}
227
Axel Naumann0ec56b72012-10-18 19:05:02 +0000228///\brief Registers an external source. If an external source already exists,
229/// creates a multiplex external source and appends to it.
230///
231///\param[in] E - A non-null external sema source.
232///
233void Sema::addExternalSource(ExternalSemaSource *E) {
234 assert(E && "Cannot use with NULL ptr");
235
236 if (!ExternalSource) {
237 ExternalSource = E;
238 return;
239 }
240
241 if (isMultiplexExternalSource)
242 static_cast<MultiplexExternalSemaSource*>(ExternalSource)->addSource(*E);
243 else {
244 ExternalSource = new MultiplexExternalSemaSource(*ExternalSource, *E);
245 isMultiplexExternalSource = true;
246 }
247}
248
Chandler Carruth5d989942011-07-06 16:21:37 +0000249/// \brief Print out statistics about the semantic analysis.
250void Sema::PrintStats() const {
251 llvm::errs() << "\n*** Semantic Analysis Stats:\n";
252 llvm::errs() << NumSFINAEErrors << " SFINAE diagnostics trapped.\n";
253
254 BumpAlloc.PrintStats();
255 AnalysisWarnings.PrintStats();
256}
257
Richard Smithc8d7f582011-11-29 22:48:16 +0000258/// ImpCastExprToType - If Expr is not of type 'Type', insert an implicit cast.
259/// If there is already an implicit cast, merge into the existing one.
260/// The result is of the given category.
261ExprResult Sema::ImpCastExprToType(Expr *E, QualType Ty,
262 CastKind Kind, ExprValueKind VK,
263 const CXXCastPath *BasePath,
264 CheckedConversionKind CCK) {
Richard Smith9c129f82011-10-28 03:31:48 +0000265#ifndef NDEBUG
266 if (VK == VK_RValue && !E->isRValue()) {
267 switch (Kind) {
268 default:
269 assert(0 && "can't implicitly cast lvalue to rvalue with this cast kind");
270 case CK_LValueToRValue:
271 case CK_ArrayToPointerDecay:
272 case CK_FunctionToPointerDecay:
273 case CK_ToVoid:
274 break;
275 }
276 }
Richard Smithacdfa4d2011-11-10 23:32:36 +0000277 assert((VK == VK_RValue || !E->isRValue()) && "can't cast rvalue to lvalue");
Richard Smith9c129f82011-10-28 03:31:48 +0000278#endif
279
John Wiegley429bb272011-04-08 18:41:53 +0000280 QualType ExprTy = Context.getCanonicalType(E->getType());
Mon P Wang3a2c7442008-09-04 08:38:01 +0000281 QualType TypeTy = Context.getCanonicalType(Ty);
Mike Stump1eb44332009-09-09 15:08:12 +0000282
Mon P Wang3a2c7442008-09-04 08:38:01 +0000283 if (ExprTy == TypeTy)
John Wiegley429bb272011-04-08 18:41:53 +0000284 return Owned(E);
Mike Stump1eb44332009-09-09 15:08:12 +0000285
David Blaikie4e4d0842012-03-11 07:00:24 +0000286 if (getLangOpts().ObjCAutoRefCount)
John McCallf85e1932011-06-15 23:02:42 +0000287 CheckObjCARCConversion(SourceRange(), Ty, E, CCK);
288
Douglas Gregor6fb745b2010-05-13 16:44:06 +0000289 // If this is a derived-to-base cast to a through a virtual base, we
290 // need a vtable.
John McCall2de56d12010-08-25 11:45:40 +0000291 if (Kind == CK_DerivedToBase &&
John McCallf871d0c2010-08-07 06:22:56 +0000292 BasePathInvolvesVirtualBase(*BasePath)) {
John Wiegley429bb272011-04-08 18:41:53 +0000293 QualType T = E->getType();
Douglas Gregor6fb745b2010-05-13 16:44:06 +0000294 if (const PointerType *Pointer = T->getAs<PointerType>())
295 T = Pointer->getPointeeType();
296 if (const RecordType *RecordTy = T->getAs<RecordType>())
John Wiegley429bb272011-04-08 18:41:53 +0000297 MarkVTableUsed(E->getLocStart(),
Douglas Gregor6fb745b2010-05-13 16:44:06 +0000298 cast<CXXRecordDecl>(RecordTy->getDecl()));
299 }
Anders Carlsson4c5fad32009-09-15 05:28:24 +0000300
Richard Smithc8d7f582011-11-29 22:48:16 +0000301 if (ImplicitCastExpr *ImpCast = dyn_cast<ImplicitCastExpr>(E)) {
302 if (ImpCast->getCastKind() == Kind && (!BasePath || BasePath->empty())) {
303 ImpCast->setType(Ty);
304 ImpCast->setValueKind(VK);
305 return Owned(E);
306 }
307 }
308
309 return Owned(ImplicitCastExpr::Create(Context, Ty, Kind, E, BasePath, VK));
Sebastian Redl906082e2010-07-20 04:20:21 +0000310}
311
Abramo Bagnara737d5442011-04-07 09:26:19 +0000312/// ScalarTypeToBooleanCastKind - Returns the cast kind corresponding
313/// to the conversion from scalar type ScalarTy to the Boolean type.
314CastKind Sema::ScalarTypeToBooleanCastKind(QualType ScalarTy) {
315 switch (ScalarTy->getScalarTypeKind()) {
316 case Type::STK_Bool: return CK_NoOp;
John McCall1d9b3b22011-09-09 05:25:32 +0000317 case Type::STK_CPointer: return CK_PointerToBoolean;
318 case Type::STK_BlockPointer: return CK_PointerToBoolean;
319 case Type::STK_ObjCObjectPointer: return CK_PointerToBoolean;
Abramo Bagnara737d5442011-04-07 09:26:19 +0000320 case Type::STK_MemberPointer: return CK_MemberPointerToBoolean;
321 case Type::STK_Integral: return CK_IntegralToBoolean;
322 case Type::STK_Floating: return CK_FloatingToBoolean;
323 case Type::STK_IntegralComplex: return CK_IntegralComplexToBoolean;
324 case Type::STK_FloatingComplex: return CK_FloatingComplexToBoolean;
325 }
326 return CK_Invalid;
327}
328
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000329/// \brief Used to prune the decls of Sema's UnusedFileScopedDecls vector.
330static bool ShouldRemoveFromUnused(Sema *SemaRef, const DeclaratorDecl *D) {
Rafael Espindola137d6622012-12-26 04:38:44 +0000331 // Template instantiation can happen at the end of the translation unit
332 // and it sets the canonical (first) decl to used. Normal uses set the last
333 // decl at the time to used and subsequent decl inherit the flag. The net
334 // result is that we need to check both ends of the decl chain.
335 if (D->isUsed() || D->getMostRecentDecl()->isUsed())
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000336 return true;
337
338 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
339 // UnusedFileScopedDecls stores the first declaration.
340 // The declaration may have become definition so check again.
341 const FunctionDecl *DeclToCheck;
342 if (FD->hasBody(DeclToCheck))
343 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
344
345 // Later redecls may add new information resulting in not having to warn,
346 // so check again.
Douglas Gregoref96ee02012-01-14 16:38:05 +0000347 DeclToCheck = FD->getMostRecentDecl();
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000348 if (DeclToCheck != FD)
349 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
350 }
351
352 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) {
353 // UnusedFileScopedDecls stores the first declaration.
354 // The declaration may have become definition so check again.
355 const VarDecl *DeclToCheck = VD->getDefinition();
356 if (DeclToCheck)
357 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
358
359 // Later redecls may add new information resulting in not having to warn,
360 // so check again.
Douglas Gregoref96ee02012-01-14 16:38:05 +0000361 DeclToCheck = VD->getMostRecentDecl();
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000362 if (DeclToCheck != VD)
363 return !SemaRef->ShouldWarnIfUnusedFileScopedDecl(DeclToCheck);
364 }
365
366 return false;
367}
368
John McCall15e310a2011-02-19 02:53:41 +0000369namespace {
370 struct UndefinedInternal {
371 NamedDecl *decl;
372 FullSourceLoc useLoc;
373
374 UndefinedInternal(NamedDecl *decl, FullSourceLoc useLoc)
375 : decl(decl), useLoc(useLoc) {}
376 };
377
378 bool operator<(const UndefinedInternal &l, const UndefinedInternal &r) {
379 return l.useLoc.isBeforeInTranslationUnitThan(r.useLoc);
380 }
381}
382
383/// checkUndefinedInternals - Check for undefined objects with internal linkage.
384static void checkUndefinedInternals(Sema &S) {
385 if (S.UndefinedInternals.empty()) return;
386
387 // Collect all the still-undefined entities with internal linkage.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000388 SmallVector<UndefinedInternal, 16> undefined;
John McCall15e310a2011-02-19 02:53:41 +0000389 for (llvm::DenseMap<NamedDecl*,SourceLocation>::iterator
390 i = S.UndefinedInternals.begin(), e = S.UndefinedInternals.end();
391 i != e; ++i) {
392 NamedDecl *decl = i->first;
393
394 // Ignore attributes that have become invalid.
395 if (decl->isInvalidDecl()) continue;
396
Rafael Espindola9f409542012-12-29 23:43:00 +0000397 // If we found out that the decl is external, don't warn.
398 if (decl->getLinkage() == ExternalLinkage) continue;
399
John McCall15e310a2011-02-19 02:53:41 +0000400 // __attribute__((weakref)) is basically a definition.
401 if (decl->hasAttr<WeakRefAttr>()) continue;
402
403 if (FunctionDecl *fn = dyn_cast<FunctionDecl>(decl)) {
404 if (fn->isPure() || fn->hasBody())
405 continue;
406 } else {
407 if (cast<VarDecl>(decl)->hasDefinition() != VarDecl::DeclarationOnly)
408 continue;
409 }
410
411 // We build a FullSourceLoc so that we can sort with array_pod_sort.
412 FullSourceLoc loc(i->second, S.Context.getSourceManager());
413 undefined.push_back(UndefinedInternal(decl, loc));
414 }
415
416 if (undefined.empty()) return;
417
418 // Sort (in order of use site) so that we're not (as) dependent on
419 // the iteration order through an llvm::DenseMap.
420 llvm::array_pod_sort(undefined.begin(), undefined.end());
421
Chris Lattner5f9e2722011-07-23 10:55:15 +0000422 for (SmallVectorImpl<UndefinedInternal>::iterator
John McCall15e310a2011-02-19 02:53:41 +0000423 i = undefined.begin(), e = undefined.end(); i != e; ++i) {
424 NamedDecl *decl = i->decl;
425 S.Diag(decl->getLocation(), diag::warn_undefined_internal)
426 << isa<VarDecl>(decl) << decl;
427 S.Diag(i->useLoc, diag::note_used_here);
428 }
429}
430
Douglas Gregor31e37b22011-07-28 18:09:57 +0000431void Sema::LoadExternalWeakUndeclaredIdentifiers() {
432 if (!ExternalSource)
433 return;
434
435 SmallVector<std::pair<IdentifierInfo *, WeakInfo>, 4> WeakIDs;
436 ExternalSource->ReadWeakUndeclaredIdentifiers(WeakIDs);
437 for (unsigned I = 0, N = WeakIDs.size(); I != N; ++I) {
438 llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator Pos
439 = WeakUndeclaredIdentifiers.find(WeakIDs[I].first);
440 if (Pos != WeakUndeclaredIdentifiers.end())
441 continue;
442
443 WeakUndeclaredIdentifiers.insert(WeakIDs[I]);
444 }
445}
446
Daniel Jasperf8cc02e2012-06-06 08:32:04 +0000447
448typedef llvm::DenseMap<const CXXRecordDecl*, bool> RecordCompleteMap;
449
450/// \brief Returns true, if all methods and nested classes of the given
451/// CXXRecordDecl are defined in this translation unit.
452///
453/// Should only be called from ActOnEndOfTranslationUnit so that all
454/// definitions are actually read.
455static bool MethodsAndNestedClassesComplete(const CXXRecordDecl *RD,
456 RecordCompleteMap &MNCComplete) {
457 RecordCompleteMap::iterator Cache = MNCComplete.find(RD);
458 if (Cache != MNCComplete.end())
459 return Cache->second;
460 if (!RD->isCompleteDefinition())
461 return false;
462 bool Complete = true;
463 for (DeclContext::decl_iterator I = RD->decls_begin(),
464 E = RD->decls_end();
465 I != E && Complete; ++I) {
466 if (const CXXMethodDecl *M = dyn_cast<CXXMethodDecl>(*I))
467 Complete = M->isDefined() || (M->isPure() && !isa<CXXDestructorDecl>(M));
Daniel Jasper0e9e9f82012-06-14 20:56:06 +0000468 else if (const FunctionTemplateDecl *F = dyn_cast<FunctionTemplateDecl>(*I))
469 Complete = F->getTemplatedDecl()->isDefined();
Daniel Jasperf8cc02e2012-06-06 08:32:04 +0000470 else if (const CXXRecordDecl *R = dyn_cast<CXXRecordDecl>(*I)) {
471 if (R->isInjectedClassName())
472 continue;
473 if (R->hasDefinition())
474 Complete = MethodsAndNestedClassesComplete(R->getDefinition(),
475 MNCComplete);
476 else
477 Complete = false;
478 }
479 }
480 MNCComplete[RD] = Complete;
481 return Complete;
482}
483
484/// \brief Returns true, if the given CXXRecordDecl is fully defined in this
485/// translation unit, i.e. all methods are defined or pure virtual and all
486/// friends, friend functions and nested classes are fully defined in this
487/// translation unit.
488///
489/// Should only be called from ActOnEndOfTranslationUnit so that all
490/// definitions are actually read.
491static bool IsRecordFullyDefined(const CXXRecordDecl *RD,
492 RecordCompleteMap &RecordsComplete,
493 RecordCompleteMap &MNCComplete) {
494 RecordCompleteMap::iterator Cache = RecordsComplete.find(RD);
495 if (Cache != RecordsComplete.end())
496 return Cache->second;
497 bool Complete = MethodsAndNestedClassesComplete(RD, MNCComplete);
498 for (CXXRecordDecl::friend_iterator I = RD->friend_begin(),
499 E = RD->friend_end();
500 I != E && Complete; ++I) {
501 // Check if friend classes and methods are complete.
502 if (TypeSourceInfo *TSI = (*I)->getFriendType()) {
503 // Friend classes are available as the TypeSourceInfo of the FriendDecl.
504 if (CXXRecordDecl *FriendD = TSI->getType()->getAsCXXRecordDecl())
505 Complete = MethodsAndNestedClassesComplete(FriendD, MNCComplete);
506 else
507 Complete = false;
508 } else {
509 // Friend functions are available through the NamedDecl of FriendDecl.
510 if (const FunctionDecl *FD =
511 dyn_cast<FunctionDecl>((*I)->getFriendDecl()))
512 Complete = FD->isDefined();
513 else
514 // This is a template friend, give up.
515 Complete = false;
516 }
517 }
518 RecordsComplete[RD] = Complete;
519 return Complete;
520}
521
Chris Lattner9299f3f2008-08-23 03:19:52 +0000522/// ActOnEndOfTranslationUnit - This is called at the very end of the
523/// translation unit when EOF is reached and all but the top-level scope is
524/// popped.
Argyrios Kyrtzidis0e036382010-08-05 09:48:16 +0000525void Sema::ActOnEndOfTranslationUnit() {
John McCall92576642012-05-07 06:16:41 +0000526 assert(DelayedDiagnostics.getCurrentPool() == NULL
527 && "reached end of translation unit with a pool attached?");
528
Douglas Gregord82f5eb2012-08-17 22:17:36 +0000529 // If code completion is enabled, don't perform any end-of-translation-unit
530 // work.
531 if (PP.isCodeCompletionEnabled())
532 return;
533
Douglas Gregor467dc882011-08-25 22:30:56 +0000534 // Only complete translation units define vtables and perform implicit
535 // instantiations.
536 if (TUKind == TU_Complete) {
Argyrios Kyrtzidis849639d2012-02-07 16:50:53 +0000537 DiagnoseUseOfUnimplementedSelectors();
538
Chandler Carruthaee543a2010-12-12 21:36:11 +0000539 // If any dynamic classes have their key function defined within
540 // this translation unit, then those vtables are considered "used" and must
541 // be emitted.
Douglas Gregora126f172011-07-28 00:53:40 +0000542 for (DynamicClassesType::iterator I = DynamicClasses.begin(ExternalSource),
543 E = DynamicClasses.end();
544 I != E; ++I) {
545 assert(!(*I)->isDependentType() &&
Anders Carlssona5c6c2a2011-01-25 18:08:22 +0000546 "Should not see dependent types here!");
Douglas Gregora126f172011-07-28 00:53:40 +0000547 if (const CXXMethodDecl *KeyFunction = Context.getKeyFunction(*I)) {
Chandler Carruthaee543a2010-12-12 21:36:11 +0000548 const FunctionDecl *Definition = 0;
549 if (KeyFunction->hasBody(Definition))
Douglas Gregora126f172011-07-28 00:53:40 +0000550 MarkVTableUsed(Definition->getLocation(), *I, true);
Chandler Carruthaee543a2010-12-12 21:36:11 +0000551 }
552 }
553
Nick Lewycky81559102011-05-31 07:58:42 +0000554 // If DefinedUsedVTables ends up marking any virtual member functions it
555 // might lead to more pending template instantiations, which we then need
556 // to instantiate.
557 DefineUsedVTables();
Argyrios Kyrtzidis0e036382010-08-05 09:48:16 +0000558
Nick Lewycky81559102011-05-31 07:58:42 +0000559 // C++: Perform implicit template instantiations.
560 //
561 // FIXME: When we perform these implicit instantiations, we do not
562 // carefully keep track of the point of instantiation (C++ [temp.point]).
563 // This means that name lookup that occurs within the template
564 // instantiation will always happen at the end of the translation unit,
565 // so it will find some names that should not be found. Although this is
566 // common behavior for C++ compilers, it is technically wrong. In the
567 // future, we either need to be able to filter the results of name lookup
568 // or we need to perform template instantiations earlier.
569 PerformPendingInstantiations();
Nick Lewycky2a5f99e2010-11-25 00:35:20 +0000570 }
Anders Carlssond6a637f2009-12-07 08:24:59 +0000571
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +0000572 // Remove file scoped decls that turned out to be used.
Douglas Gregora2ee20a2011-07-27 21:45:57 +0000573 UnusedFileScopedDecls.erase(std::remove_if(UnusedFileScopedDecls.begin(0,
574 true),
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000575 UnusedFileScopedDecls.end(),
576 std::bind1st(std::ptr_fun(ShouldRemoveFromUnused),
577 this)),
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +0000578 UnusedFileScopedDecls.end());
Douglas Gregor47268a32010-04-09 17:41:13 +0000579
Douglas Gregor467dc882011-08-25 22:30:56 +0000580 if (TUKind == TU_Prefix) {
581 // Translation unit prefixes don't need any of the checking below.
Douglas Gregor87c08a52010-08-13 22:48:40 +0000582 TUScope = 0;
Argyrios Kyrtzidis72b90572010-08-05 09:48:08 +0000583 return;
Douglas Gregor87c08a52010-08-13 22:48:40 +0000584 }
Argyrios Kyrtzidis72b90572010-08-05 09:48:08 +0000585
Chris Lattner63d65f82009-09-08 18:19:27 +0000586 // Check for #pragma weak identifiers that were never declared
587 // FIXME: This will cause diagnostics to be emitted in a non-determinstic
588 // order! Iterating over a densemap like this is bad.
Douglas Gregor31e37b22011-07-28 18:09:57 +0000589 LoadExternalWeakUndeclaredIdentifiers();
Ryan Flynne25ff832009-07-30 03:15:39 +0000590 for (llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator
Chris Lattner63d65f82009-09-08 18:19:27 +0000591 I = WeakUndeclaredIdentifiers.begin(),
592 E = WeakUndeclaredIdentifiers.end(); I != E; ++I) {
593 if (I->second.getUsed()) continue;
Mike Stump1eb44332009-09-09 15:08:12 +0000594
Chris Lattner63d65f82009-09-08 18:19:27 +0000595 Diag(I->second.getLocation(), diag::warn_weak_identifier_undeclared)
596 << I->first;
Ryan Flynne25ff832009-07-30 03:15:39 +0000597 }
598
Douglas Gregor467dc882011-08-25 22:30:56 +0000599 if (TUKind == TU_Module) {
Douglas Gregor90db2602011-12-02 01:47:07 +0000600 // If we are building a module, resolve all of the exported declarations
601 // now.
602 if (Module *CurrentModule = PP.getCurrentModule()) {
603 ModuleMap &ModMap = PP.getHeaderSearchInfo().getModuleMap();
604
605 llvm::SmallVector<Module *, 2> Stack;
606 Stack.push_back(CurrentModule);
607 while (!Stack.empty()) {
608 Module *Mod = Stack.back();
609 Stack.pop_back();
610
611 // Resolve the exported declarations.
612 // FIXME: Actually complain, once we figure out how to teach the
613 // diagnostic client to deal with complains in the module map at this
614 // point.
615 ModMap.resolveExports(Mod, /*Complain=*/false);
616
617 // Queue the submodules, so their exports will also be resolved.
Douglas Gregorb7a78192012-01-04 23:32:19 +0000618 for (Module::submodule_iterator Sub = Mod->submodule_begin(),
619 SubEnd = Mod->submodule_end();
Douglas Gregor90db2602011-12-02 01:47:07 +0000620 Sub != SubEnd; ++Sub) {
Douglas Gregorb7a78192012-01-04 23:32:19 +0000621 Stack.push_back(*Sub);
Douglas Gregor90db2602011-12-02 01:47:07 +0000622 }
623 }
624 }
625
Douglas Gregor467dc882011-08-25 22:30:56 +0000626 // Modules don't need any of the checking below.
627 TUScope = 0;
628 return;
629 }
630
Douglas Gregor275a3692009-03-10 23:43:53 +0000631 // C99 6.9.2p2:
632 // A declaration of an identifier for an object that has file
633 // scope without an initializer, and without a storage-class
634 // specifier or with the storage-class specifier static,
635 // constitutes a tentative definition. If a translation unit
636 // contains one or more tentative definitions for an identifier,
637 // and the translation unit contains no external definition for
638 // that identifier, then the behavior is exactly as if the
639 // translation unit contains a file scope declaration of that
640 // identifier, with the composite type as of the end of the
641 // translation unit, with an initializer equal to 0.
Sebastian Redle9d12b62010-01-31 22:27:38 +0000642 llvm::SmallSet<VarDecl *, 32> Seen;
Douglas Gregora8623202011-07-27 20:58:46 +0000643 for (TentativeDefinitionsType::iterator
644 T = TentativeDefinitions.begin(ExternalSource),
645 TEnd = TentativeDefinitions.end();
646 T != TEnd; ++T)
647 {
648 VarDecl *VD = (*T)->getActingDefinition();
Mike Stump1eb44332009-09-09 15:08:12 +0000649
Sebastian Redle9d12b62010-01-31 22:27:38 +0000650 // If the tentative definition was completed, getActingDefinition() returns
651 // null. If we've already seen this variable before, insert()'s second
652 // return value is false.
653 if (VD == 0 || VD->isInvalidDecl() || !Seen.insert(VD))
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000654 continue;
655
Mike Stump1eb44332009-09-09 15:08:12 +0000656 if (const IncompleteArrayType *ArrayT
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000657 = Context.getAsIncompleteArrayType(VD->getType())) {
Mike Stump1eb44332009-09-09 15:08:12 +0000658 if (RequireCompleteType(VD->getLocation(),
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000659 ArrayT->getElementType(),
Chris Lattner63d65f82009-09-08 18:19:27 +0000660 diag::err_tentative_def_incomplete_type_arr)) {
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000661 VD->setInvalidDecl();
Chris Lattner63d65f82009-09-08 18:19:27 +0000662 continue;
Douglas Gregor275a3692009-03-10 23:43:53 +0000663 }
Mike Stump1eb44332009-09-09 15:08:12 +0000664
Chris Lattner63d65f82009-09-08 18:19:27 +0000665 // Set the length of the array to 1 (C99 6.9.2p5).
666 Diag(VD->getLocation(), diag::warn_tentative_incomplete_array);
667 llvm::APInt One(Context.getTypeSize(Context.getSizeType()), true);
John McCall46a617a2009-10-16 00:14:28 +0000668 QualType T = Context.getConstantArrayType(ArrayT->getElementType(),
669 One, ArrayType::Normal, 0);
Chris Lattner63d65f82009-09-08 18:19:27 +0000670 VD->setType(T);
Mike Stump1eb44332009-09-09 15:08:12 +0000671 } else if (RequireCompleteType(VD->getLocation(), VD->getType(),
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000672 diag::err_tentative_def_incomplete_type))
673 VD->setInvalidDecl();
674
Eli Friedmane4851f22012-10-23 20:19:32 +0000675 CheckCompleteVariableDeclaration(VD);
676
Douglas Gregorb6c8c8b2009-04-21 17:11:58 +0000677 // Notify the consumer that we've completed a tentative definition.
678 if (!VD->isInvalidDecl())
679 Consumer.CompleteTentativeDefinition(VD);
680
Douglas Gregor275a3692009-03-10 23:43:53 +0000681 }
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000682
Sean Huntc1598702011-05-05 00:05:47 +0000683 if (LangOpts.CPlusPlus0x &&
684 Diags.getDiagnosticLevel(diag::warn_delegating_ctor_cycle,
685 SourceLocation())
David Blaikied6471f72011-09-25 23:23:43 +0000686 != DiagnosticsEngine::Ignored)
Sean Huntfe57eef2011-05-04 05:57:24 +0000687 CheckDelegatingCtorCycles();
688
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000689 // If there were errors, disable 'unused' warnings since they will mostly be
690 // noise.
691 if (!Diags.hasErrorOccurred()) {
692 // Output warning for unused file scoped decls.
Douglas Gregora2ee20a2011-07-27 21:45:57 +0000693 for (UnusedFileScopedDeclsType::iterator
694 I = UnusedFileScopedDecls.begin(ExternalSource),
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000695 E = UnusedFileScopedDecls.end(); I != E; ++I) {
Douglas Gregora2ee20a2011-07-27 21:45:57 +0000696 if (ShouldRemoveFromUnused(this, *I))
697 continue;
698
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000699 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(*I)) {
700 const FunctionDecl *DiagD;
701 if (!FD->hasBody(DiagD))
702 DiagD = FD;
Argyrios Kyrtzidis48b89592011-03-03 17:47:42 +0000703 if (DiagD->isDeleted())
704 continue; // Deleted functions are supposed to be unused.
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +0000705 if (DiagD->isReferenced()) {
706 if (isa<CXXMethodDecl>(DiagD))
707 Diag(DiagD->getLocation(), diag::warn_unneeded_member_function)
708 << DiagD->getDeclName();
Fariborz Jahanian12d2cc72012-06-27 19:43:29 +0000709 else {
710 if (FD->getStorageClassAsWritten() == SC_Static &&
711 !FD->isInlineSpecified() &&
712 !SourceMgr.isFromMainFile(
713 SourceMgr.getExpansionLoc(FD->getLocation())))
714 Diag(DiagD->getLocation(), diag::warn_unneeded_static_internal_decl)
715 << DiagD->getDeclName();
716 else
717 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
718 << /*function*/0 << DiagD->getDeclName();
719 }
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +0000720 } else {
721 Diag(DiagD->getLocation(),
722 isa<CXXMethodDecl>(DiagD) ? diag::warn_unused_member_function
723 : diag::warn_unused_function)
724 << DiagD->getDeclName();
725 }
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000726 } else {
727 const VarDecl *DiagD = cast<VarDecl>(*I)->getDefinition();
728 if (!DiagD)
729 DiagD = cast<VarDecl>(*I);
Argyrios Kyrtzidis6b6b42a2011-04-19 19:51:10 +0000730 if (DiagD->isReferenced()) {
731 Diag(DiagD->getLocation(), diag::warn_unneeded_internal_decl)
732 << /*variable*/1 << DiagD->getDeclName();
733 } else {
734 Diag(DiagD->getLocation(), diag::warn_unused_variable)
735 << DiagD->getDeclName();
736 }
Argyrios Kyrtzidis43f0a7c2011-01-31 07:04:37 +0000737 }
Argyrios Kyrtzidisbbc64542010-08-15 01:15:20 +0000738 }
John McCall15e310a2011-02-19 02:53:41 +0000739
740 checkUndefinedInternals(*this);
Argyrios Kyrtzidis49b96d12010-08-13 18:42:17 +0000741 }
Douglas Gregor87c08a52010-08-13 22:48:40 +0000742
Daniel Jasperf8cc02e2012-06-06 08:32:04 +0000743 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field,
744 SourceLocation())
745 != DiagnosticsEngine::Ignored) {
746 RecordCompleteMap RecordsComplete;
747 RecordCompleteMap MNCComplete;
748 for (NamedDeclSetType::iterator I = UnusedPrivateFields.begin(),
749 E = UnusedPrivateFields.end(); I != E; ++I) {
750 const NamedDecl *D = *I;
751 const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
752 if (RD && !RD->isUnion() &&
753 IsRecordFullyDefined(RD, RecordsComplete, MNCComplete)) {
754 Diag(D->getLocation(), diag::warn_unused_private_field)
755 << D->getDeclName();
756 }
757 }
758 }
759
Richard Smith483b9f32011-02-21 20:05:19 +0000760 // Check we've noticed that we're no longer parsing the initializer for every
761 // variable. If we miss cases, then at best we have a performance issue and
762 // at worst a rejects-valid bug.
763 assert(ParsingInitForAutoVars.empty() &&
764 "Didn't unmark var as having its initializer parsed");
765
Douglas Gregor87c08a52010-08-13 22:48:40 +0000766 TUScope = 0;
Chris Lattner9299f3f2008-08-23 03:19:52 +0000767}
768
769
Reid Spencer5f016e22007-07-11 17:01:13 +0000770//===----------------------------------------------------------------------===//
771// Helper functions.
772//===----------------------------------------------------------------------===//
773
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000774DeclContext *Sema::getFunctionLevelDeclContext() {
John McCalldb0ee1d2009-12-19 10:53:49 +0000775 DeclContext *DC = CurContext;
Mike Stump1eb44332009-09-09 15:08:12 +0000776
Eli Friedman72899c32012-01-07 04:59:52 +0000777 while (true) {
778 if (isa<BlockDecl>(DC) || isa<EnumDecl>(DC)) {
779 DC = DC->getParent();
780 } else if (isa<CXXMethodDecl>(DC) &&
Douglas Gregor215e4e12012-02-12 17:34:23 +0000781 cast<CXXMethodDecl>(DC)->getOverloadedOperator() == OO_Call &&
Eli Friedman72899c32012-01-07 04:59:52 +0000782 cast<CXXRecordDecl>(DC->getParent())->isLambda()) {
783 DC = DC->getParent()->getParent();
784 }
785 else break;
786 }
Mike Stump1eb44332009-09-09 15:08:12 +0000787
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000788 return DC;
789}
790
Chris Lattner371f2582008-12-04 23:50:19 +0000791/// getCurFunctionDecl - If inside of a function body, this returns a pointer
792/// to the function decl for the function being parsed. If we're currently
793/// in a 'block', this returns the containing context.
794FunctionDecl *Sema::getCurFunctionDecl() {
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000795 DeclContext *DC = getFunctionLevelDeclContext();
Chris Lattner371f2582008-12-04 23:50:19 +0000796 return dyn_cast<FunctionDecl>(DC);
797}
798
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +0000799ObjCMethodDecl *Sema::getCurMethodDecl() {
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000800 DeclContext *DC = getFunctionLevelDeclContext();
Steve Naroffd7612e12008-11-17 16:28:52 +0000801 return dyn_cast<ObjCMethodDecl>(DC);
Daniel Dunbarc4a1dea2008-08-11 05:35:13 +0000802}
Chris Lattner371f2582008-12-04 23:50:19 +0000803
804NamedDecl *Sema::getCurFunctionOrMethodDecl() {
Anders Carlsson8517d9b2009-08-08 17:45:02 +0000805 DeclContext *DC = getFunctionLevelDeclContext();
Chris Lattner371f2582008-12-04 23:50:19 +0000806 if (isa<ObjCMethodDecl>(DC) || isa<FunctionDecl>(DC))
Douglas Gregor4afa39d2009-01-20 01:17:11 +0000807 return cast<NamedDecl>(DC);
Chris Lattner371f2582008-12-04 23:50:19 +0000808 return 0;
809}
810
Daniel Dunbar393eed72012-03-14 09:49:32 +0000811void Sema::EmitCurrentDiagnostic(unsigned DiagID) {
812 // FIXME: It doesn't make sense to me that DiagID is an incoming argument here
813 // and yet we also use the current diag ID on the DiagnosticsEngine. This has
814 // been made more painfully obvious by the refactor that introduced this
815 // function, but it is possible that the incoming argument can be
816 // eliminnated. If it truly cannot be (for example, there is some reentrancy
817 // issue I am not seeing yet), then there should at least be a clarifying
818 // comment somewhere.
819 if (llvm::Optional<TemplateDeductionInfo*> Info = isSFINAEContext()) {
820 switch (DiagnosticIDs::getDiagnosticSFINAEResponse(
821 Diags.getCurrentDiagID())) {
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000822 case DiagnosticIDs::SFINAE_Report:
Richard Smith77faa362011-10-19 00:07:01 +0000823 // We'll report the diagnostic below.
Douglas Gregor9b623632010-10-12 23:32:35 +0000824 break;
825
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000826 case DiagnosticIDs::SFINAE_SubstitutionFailure:
Douglas Gregor9b623632010-10-12 23:32:35 +0000827 // Count this failure so that we know that template argument deduction
828 // has failed.
Daniel Dunbar393eed72012-03-14 09:49:32 +0000829 ++NumSFINAEErrors;
Richard Smithb8590f32012-05-07 09:03:25 +0000830
831 // Make a copy of this suppressed diagnostic and store it with the
832 // template-deduction information.
833 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
834 Diagnostic DiagInfo(&Diags);
835 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
836 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
837 }
838
Daniel Dunbar393eed72012-03-14 09:49:32 +0000839 Diags.setLastDiagnosticIgnored();
840 Diags.Clear();
Douglas Gregor9b623632010-10-12 23:32:35 +0000841 return;
842
Richard Smith77faa362011-10-19 00:07:01 +0000843 case DiagnosticIDs::SFINAE_AccessControl: {
844 // Per C++ Core Issue 1170, access control is part of SFINAE.
Daniel Dunbar00b43842012-03-13 18:30:54 +0000845 // Additionally, the AccessCheckingSFINAE flag can be used to temporarily
Richard Smith77faa362011-10-19 00:07:01 +0000846 // make access control a part of SFINAE for the purposes of checking
847 // type traits.
Daniel Dunbar393eed72012-03-14 09:49:32 +0000848 if (!AccessCheckingSFINAE && !getLangOpts().CPlusPlus0x)
Richard Smith77faa362011-10-19 00:07:01 +0000849 break;
850
Daniel Dunbar393eed72012-03-14 09:49:32 +0000851 SourceLocation Loc = Diags.getCurrentDiagLoc();
Richard Smith77faa362011-10-19 00:07:01 +0000852
853 // Suppress this diagnostic.
Daniel Dunbar393eed72012-03-14 09:49:32 +0000854 ++NumSFINAEErrors;
Richard Smithb8590f32012-05-07 09:03:25 +0000855
856 // Make a copy of this suppressed diagnostic and store it with the
857 // template-deduction information.
858 if (*Info && !(*Info)->hasSFINAEDiagnostic()) {
859 Diagnostic DiagInfo(&Diags);
860 (*Info)->addSFINAEDiagnostic(DiagInfo.getLocation(),
861 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
862 }
863
Daniel Dunbar393eed72012-03-14 09:49:32 +0000864 Diags.setLastDiagnosticIgnored();
865 Diags.Clear();
Richard Smith77faa362011-10-19 00:07:01 +0000866
867 // Now the diagnostic state is clear, produce a C++98 compatibility
868 // warning.
Daniel Dunbar393eed72012-03-14 09:49:32 +0000869 Diag(Loc, diag::warn_cxx98_compat_sfinae_access_control);
Richard Smith77faa362011-10-19 00:07:01 +0000870
871 // The last diagnostic which Sema produced was ignored. Suppress any
872 // notes attached to it.
Daniel Dunbar393eed72012-03-14 09:49:32 +0000873 Diags.setLastDiagnosticIgnored();
Richard Smith77faa362011-10-19 00:07:01 +0000874 return;
875 }
876
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000877 case DiagnosticIDs::SFINAE_Suppress:
Douglas Gregor9b623632010-10-12 23:32:35 +0000878 // Make a copy of this suppressed diagnostic and store it with the
879 // template-deduction information;
Richard Smithb8590f32012-05-07 09:03:25 +0000880 if (*Info) {
881 Diagnostic DiagInfo(&Diags);
Douglas Gregor1eee5dc2011-01-27 22:31:44 +0000882 (*Info)->addSuppressedDiagnostic(DiagInfo.getLocation(),
Richard Smithb8590f32012-05-07 09:03:25 +0000883 PartialDiagnostic(DiagInfo, Context.getDiagAllocator()));
884 }
885
886 // Suppress this diagnostic.
Daniel Dunbar393eed72012-03-14 09:49:32 +0000887 Diags.setLastDiagnosticIgnored();
888 Diags.Clear();
Douglas Gregor9b623632010-10-12 23:32:35 +0000889 return;
890 }
891 }
892
Douglas Gregor8987b232011-09-27 23:30:47 +0000893 // Set up the context's printing policy based on our current state.
Daniel Dunbar393eed72012-03-14 09:49:32 +0000894 Context.setPrintingPolicy(getPrintingPolicy());
Douglas Gregor8987b232011-09-27 23:30:47 +0000895
Douglas Gregor9b623632010-10-12 23:32:35 +0000896 // Emit the diagnostic.
Daniel Dunbar393eed72012-03-14 09:49:32 +0000897 if (!Diags.EmitCurrentDiagnostic())
Douglas Gregor5e9f35c2009-06-14 07:33:30 +0000898 return;
Mike Stump1eb44332009-09-09 15:08:12 +0000899
Douglas Gregor25a88bb2009-03-20 22:48:49 +0000900 // If this is not a note, and we're in a template instantiation
901 // that is different from the last template instantiation where
902 // we emitted an error, print a template instantiation
903 // backtrace.
Argyrios Kyrtzidis33e4e702010-11-18 20:06:41 +0000904 if (!DiagnosticIDs::isBuiltinNote(DiagID) &&
Daniel Dunbar393eed72012-03-14 09:49:32 +0000905 !ActiveTemplateInstantiations.empty() &&
906 ActiveTemplateInstantiations.back()
907 != LastTemplateInstantiationErrorContext) {
908 PrintInstantiationStack();
909 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiations.back();
Douglas Gregor25a88bb2009-03-20 22:48:49 +0000910 }
911}
Douglas Gregor2e222532009-07-02 17:08:52 +0000912
Anders Carlsson91a0cc92009-08-26 22:33:56 +0000913Sema::SemaDiagnosticBuilder
914Sema::Diag(SourceLocation Loc, const PartialDiagnostic& PD) {
915 SemaDiagnosticBuilder Builder(Diag(Loc, PD.getDiagID()));
916 PD.Emit(Builder);
Mike Stump1eb44332009-09-09 15:08:12 +0000917
Anders Carlsson91a0cc92009-08-26 22:33:56 +0000918 return Builder;
919}
920
Chandler Carruth108f7562011-07-26 05:40:03 +0000921/// \brief Looks through the macro-expansion chain for the given
922/// location, looking for a macro expansion with the given name.
John McCall834e3f62011-03-08 07:59:04 +0000923/// If one is found, returns true and sets the location to that
Chandler Carruth108f7562011-07-26 05:40:03 +0000924/// expansion loc.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000925bool Sema::findMacroSpelling(SourceLocation &locref, StringRef name) {
John McCall834e3f62011-03-08 07:59:04 +0000926 SourceLocation loc = locref;
927 if (!loc.isMacroID()) return false;
928
929 // There's no good way right now to look at the intermediate
Chandler Carruth108f7562011-07-26 05:40:03 +0000930 // expansions, so just jump to the expansion location.
Chandler Carruth40278532011-07-25 16:49:02 +0000931 loc = getSourceManager().getExpansionLoc(loc);
John McCall834e3f62011-03-08 07:59:04 +0000932
933 // If that's written with the name, stop here.
Chris Lattner5f9e2722011-07-23 10:55:15 +0000934 SmallVector<char, 16> buffer;
John McCall834e3f62011-03-08 07:59:04 +0000935 if (getPreprocessor().getSpelling(loc, buffer) == name) {
936 locref = loc;
937 return true;
938 }
939 return false;
940}
941
Douglas Gregor23c94db2010-07-02 17:43:08 +0000942/// \brief Determines the active Scope associated with the given declaration
943/// context.
944///
945/// This routine maps a declaration context to the active Scope object that
946/// represents that declaration context in the parser. It is typically used
947/// from "scope-less" code (e.g., template instantiation, lazy creation of
948/// declarations) that injects a name for name-lookup purposes and, therefore,
949/// must update the Scope.
950///
951/// \returns The scope corresponding to the given declaraion context, or NULL
952/// if no such scope is open.
953Scope *Sema::getScopeForContext(DeclContext *Ctx) {
954
955 if (!Ctx)
956 return 0;
957
958 Ctx = Ctx->getPrimaryContext();
959 for (Scope *S = getCurScope(); S; S = S->getParent()) {
Sebastian Redlcddc69f2010-07-08 23:07:34 +0000960 // Ignore scopes that cannot have declarations. This is important for
961 // out-of-line definitions of static class members.
962 if (S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope))
963 if (DeclContext *Entity = static_cast<DeclContext *> (S->getEntity()))
964 if (Ctx == Entity->getPrimaryContext())
965 return S;
Douglas Gregor23c94db2010-07-02 17:43:08 +0000966 }
967
968 return 0;
969}
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000970
971/// \brief Enter a new function scope
972void Sema::PushFunctionScope() {
John McCall781472f2010-08-25 08:40:02 +0000973 if (FunctionScopes.size() == 1) {
974 // Use the "top" function scope rather than having to allocate
975 // memory for a new scope.
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +0000976 FunctionScopes.back()->Clear();
John McCall781472f2010-08-25 08:40:02 +0000977 FunctionScopes.push_back(FunctionScopes.back());
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000978 return;
979 }
980
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +0000981 FunctionScopes.push_back(new FunctionScopeInfo(getDiagnostics()));
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000982}
983
984void Sema::PushBlockScope(Scope *BlockScope, BlockDecl *Block) {
Argyrios Kyrtzidis8fc32d22010-11-19 00:19:15 +0000985 FunctionScopes.push_back(new BlockScopeInfo(getDiagnostics(),
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +0000986 BlockScope, Block));
987}
988
Douglas Gregor76e3da52012-02-08 20:17:14 +0000989void Sema::PushLambdaScope(CXXRecordDecl *Lambda,
990 CXXMethodDecl *CallOperator) {
991 FunctionScopes.push_back(new LambdaScopeInfo(getDiagnostics(), Lambda,
992 CallOperator));
Eli Friedmanec9ea722012-01-05 03:35:19 +0000993}
994
995void Sema::PopFunctionScopeInfo(const AnalysisBasedWarnings::Policy *WP,
996 const Decl *D, const BlockExpr *blkExpr) {
Ted Kremenek3ed6fc02011-02-23 01:51:48 +0000997 FunctionScopeInfo *Scope = FunctionScopes.pop_back_val();
John McCall781472f2010-08-25 08:40:02 +0000998 assert(!FunctionScopes.empty() && "mismatched push/pop!");
Ted Kremenek3ed6fc02011-02-23 01:51:48 +0000999
1000 // Issue any analysis-based warnings.
1001 if (WP && D)
Ted Kremenek283a3582011-02-23 01:51:53 +00001002 AnalysisWarnings.IssueWarnings(*WP, Scope, D, blkExpr);
Ted Kremenek351ba912011-02-23 01:52:04 +00001003 else {
Chris Lattner5f9e2722011-07-23 10:55:15 +00001004 for (SmallVectorImpl<sema::PossiblyUnreachableDiag>::iterator
Ted Kremenek351ba912011-02-23 01:52:04 +00001005 i = Scope->PossiblyUnreachableDiags.begin(),
1006 e = Scope->PossiblyUnreachableDiags.end();
1007 i != e; ++i) {
1008 const sema::PossiblyUnreachableDiag &D = *i;
1009 Diag(D.Loc, D.PD);
1010 }
1011 }
Ted Kremenek3ed6fc02011-02-23 01:51:48 +00001012
Ted Kremenek351ba912011-02-23 01:52:04 +00001013 if (FunctionScopes.back() != Scope) {
John McCall781472f2010-08-25 08:40:02 +00001014 delete Scope;
Ted Kremenek351ba912011-02-23 01:52:04 +00001015 }
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00001016}
1017
Dmitri Gribenko625bb562012-02-14 22:14:32 +00001018void Sema::PushCompoundScope() {
1019 getCurFunction()->CompoundScopes.push_back(CompoundScopeInfo());
1020}
1021
1022void Sema::PopCompoundScope() {
1023 FunctionScopeInfo *CurFunction = getCurFunction();
1024 assert(!CurFunction->CompoundScopes.empty() && "mismatched push/pop");
1025
1026 CurFunction->CompoundScopes.pop_back();
1027}
1028
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00001029/// \brief Determine whether any errors occurred within this function/method/
1030/// block.
John McCallf85e1932011-06-15 23:02:42 +00001031bool Sema::hasAnyUnrecoverableErrorsInThisFunction() const {
1032 return getCurFunction()->ErrorTrap.hasUnrecoverableErrorOccurred();
Douglas Gregor9ea9bdb2010-03-01 23:15:13 +00001033}
1034
1035BlockScopeInfo *Sema::getCurBlock() {
1036 if (FunctionScopes.empty())
1037 return 0;
1038
1039 return dyn_cast<BlockScopeInfo>(FunctionScopes.back());
1040}
John McCall76bd1f32010-06-01 09:23:16 +00001041
Eli Friedman906a7e12012-01-06 03:05:34 +00001042LambdaScopeInfo *Sema::getCurLambda() {
1043 if (FunctionScopes.empty())
1044 return 0;
1045
1046 return dyn_cast<LambdaScopeInfo>(FunctionScopes.back());
1047}
1048
Dmitri Gribenkoaa0cd852012-06-20 00:34:58 +00001049void Sema::ActOnComment(SourceRange Comment) {
Ted Kremenek127ff2e2012-09-13 06:41:18 +00001050 if (!LangOpts.RetainCommentsFromSystemHeaders &&
1051 SourceMgr.isInSystemHeader(Comment.getBegin()))
1052 return;
Dmitri Gribenkoaa0cd852012-06-20 00:34:58 +00001053 RawComment RC(SourceMgr, Comment);
Dmitri Gribenko9dda4742012-06-22 16:02:55 +00001054 if (RC.isAlmostTrailingComment()) {
1055 SourceRange MagicMarkerRange(Comment.getBegin(),
1056 Comment.getBegin().getLocWithOffset(3));
1057 StringRef MagicMarkerText;
1058 switch (RC.getKind()) {
Abramo Bagnarac50a0e32012-07-04 07:30:26 +00001059 case RawComment::RCK_OrdinaryBCPL:
Dmitri Gribenko9dda4742012-06-22 16:02:55 +00001060 MagicMarkerText = "///<";
1061 break;
Abramo Bagnarac50a0e32012-07-04 07:30:26 +00001062 case RawComment::RCK_OrdinaryC:
Dmitri Gribenko9dda4742012-06-22 16:02:55 +00001063 MagicMarkerText = "/**<";
1064 break;
1065 default:
1066 llvm_unreachable("if this is an almost Doxygen comment, "
1067 "it should be ordinary");
1068 }
1069 Diag(Comment.getBegin(), diag::warn_not_a_doxygen_trailing_member_comment) <<
1070 FixItHint::CreateReplacement(MagicMarkerRange, MagicMarkerText);
1071 }
Dmitri Gribenkoaa0cd852012-06-20 00:34:58 +00001072 Context.addComment(RC);
1073}
1074
John McCall76bd1f32010-06-01 09:23:16 +00001075// Pin this vtable to this file.
1076ExternalSemaSource::~ExternalSemaSource() {}
John McCallf312b1e2010-08-26 23:41:50 +00001077
Douglas Gregor5ac4b692012-01-25 00:49:42 +00001078void ExternalSemaSource::ReadMethodPool(Selector Sel) { }
Sebastian Redl8c845712010-09-28 20:23:00 +00001079
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001080void ExternalSemaSource::ReadKnownNamespaces(
Chris Lattner5f9e2722011-07-23 10:55:15 +00001081 SmallVectorImpl<NamespaceDecl *> &Namespaces) {
Douglas Gregord8bba9c2011-06-28 16:20:02 +00001082}
1083
Chris Lattner5f9e2722011-07-23 10:55:15 +00001084void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
John McCallf312b1e2010-08-26 23:41:50 +00001085 SourceLocation Loc = this->Loc;
1086 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
1087 if (Loc.isValid()) {
1088 Loc.print(OS, S.getSourceManager());
1089 OS << ": ";
1090 }
1091 OS << Message;
1092
1093 if (TheDecl && isa<NamedDecl>(TheDecl)) {
1094 std::string Name = cast<NamedDecl>(TheDecl)->getNameAsString();
1095 if (!Name.empty())
1096 OS << " '" << Name << '\'';
1097 }
1098
1099 OS << '\n';
1100}
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001101
1102/// \brief Figure out if an expression could be turned into a call.
1103///
1104/// Use this when trying to recover from an error where the programmer may have
1105/// written just the name of a function instead of actually calling it.
1106///
1107/// \param E - The expression to examine.
1108/// \param ZeroArgCallReturnTy - If the expression can be turned into a call
1109/// with no arguments, this parameter is set to the type returned by such a
1110/// call; otherwise, it is set to an empty QualType.
John McCall6dbba4f2011-10-11 23:14:30 +00001111/// \param OverloadSet - If the expression is an overloaded function
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001112/// name, this parameter is populated with the decls of the various overloads.
1113bool Sema::isExprCallable(const Expr &E, QualType &ZeroArgCallReturnTy,
John McCall6dbba4f2011-10-11 23:14:30 +00001114 UnresolvedSetImpl &OverloadSet) {
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001115 ZeroArgCallReturnTy = QualType();
John McCall6dbba4f2011-10-11 23:14:30 +00001116 OverloadSet.clear();
1117
1118 if (E.getType() == Context.OverloadTy) {
1119 OverloadExpr::FindResult FR = OverloadExpr::find(const_cast<Expr*>(&E));
1120 const OverloadExpr *Overloads = FR.Expression;
1121
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001122 for (OverloadExpr::decls_iterator it = Overloads->decls_begin(),
1123 DeclsEnd = Overloads->decls_end(); it != DeclsEnd; ++it) {
John McCall6dbba4f2011-10-11 23:14:30 +00001124 OverloadSet.addDecl(*it);
1125
1126 // Check whether the function is a non-template which takes no
1127 // arguments.
1128 if (const FunctionDecl *OverloadDecl
1129 = dyn_cast<FunctionDecl>((*it)->getUnderlyingDecl())) {
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001130 if (OverloadDecl->getMinRequiredArguments() == 0)
1131 ZeroArgCallReturnTy = OverloadDecl->getResultType();
1132 }
1133 }
John McCall6dbba4f2011-10-11 23:14:30 +00001134
Douglas Gregor64a371f2011-10-13 18:26:27 +00001135 // Ignore overloads that are pointer-to-member constants.
1136 if (FR.HasFormOfMemberPointer)
John McCall6dbba4f2011-10-11 23:14:30 +00001137 return false;
1138
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001139 return true;
1140 }
1141
John McCall6dbba4f2011-10-11 23:14:30 +00001142 if (const DeclRefExpr *DeclRef = dyn_cast<DeclRefExpr>(E.IgnoreParens())) {
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001143 if (const FunctionDecl *Fun = dyn_cast<FunctionDecl>(DeclRef->getDecl())) {
1144 if (Fun->getMinRequiredArguments() == 0)
1145 ZeroArgCallReturnTy = Fun->getResultType();
1146 return true;
1147 }
1148 }
1149
1150 // We don't have an expression that's convenient to get a FunctionDecl from,
1151 // but we can at least check if the type is "function of 0 arguments".
1152 QualType ExprTy = E.getType();
1153 const FunctionType *FunTy = NULL;
Matt Beaumont-Gay9389ddc2011-05-05 00:59:35 +00001154 QualType PointeeTy = ExprTy->getPointeeType();
1155 if (!PointeeTy.isNull())
1156 FunTy = PointeeTy->getAs<FunctionType>();
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001157 if (!FunTy)
1158 FunTy = ExprTy->getAs<FunctionType>();
1159 if (!FunTy && ExprTy == Context.BoundMemberTy) {
1160 // Look for the bound-member type. If it's still overloaded, give up,
1161 // although we probably should have fallen into the OverloadExpr case above
1162 // if we actually have an overloaded bound member.
1163 QualType BoundMemberTy = Expr::findBoundMemberType(&E);
1164 if (!BoundMemberTy.isNull())
1165 FunTy = BoundMemberTy->castAs<FunctionType>();
1166 }
1167
1168 if (const FunctionProtoType *FPT =
1169 dyn_cast_or_null<FunctionProtoType>(FunTy)) {
1170 if (FPT->getNumArgs() == 0)
1171 ZeroArgCallReturnTy = FunTy->getResultType();
1172 return true;
1173 }
1174 return false;
1175}
1176
1177/// \brief Give notes for a set of overloads.
1178///
1179/// A companion to isExprCallable. In cases when the name that the programmer
1180/// wrote was an overloaded function, we may be able to make some guesses about
1181/// plausible overloads based on their return types; such guesses can be handed
1182/// off to this method to be emitted as notes.
1183///
1184/// \param Overloads - The overloads to note.
1185/// \param FinalNoteLoc - If we've suppressed printing some overloads due to
1186/// -fshow-overloads=best, this is the location to attach to the note about too
1187/// many candidates. Typically this will be the location of the original
1188/// ill-formed expression.
John McCall6dbba4f2011-10-11 23:14:30 +00001189static void noteOverloads(Sema &S, const UnresolvedSetImpl &Overloads,
1190 const SourceLocation FinalNoteLoc) {
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001191 int ShownOverloads = 0;
1192 int SuppressedOverloads = 0;
1193 for (UnresolvedSetImpl::iterator It = Overloads.begin(),
1194 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1195 // FIXME: Magic number for max shown overloads stolen from
1196 // OverloadCandidateSet::NoteCandidates.
Douglas Gregordc7b6412012-10-23 23:11:23 +00001197 if (ShownOverloads >= 4 && S.Diags.getShowOverloads() == Ovl_Best) {
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001198 ++SuppressedOverloads;
1199 continue;
1200 }
John McCall6dbba4f2011-10-11 23:14:30 +00001201
1202 NamedDecl *Fn = (*It)->getUnderlyingDecl();
Abramo Bagnara9c0e1ec2011-11-15 21:43:28 +00001203 S.Diag(Fn->getLocation(), diag::note_possible_target_of_call);
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001204 ++ShownOverloads;
1205 }
John McCall6dbba4f2011-10-11 23:14:30 +00001206
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001207 if (SuppressedOverloads)
John McCall6dbba4f2011-10-11 23:14:30 +00001208 S.Diag(FinalNoteLoc, diag::note_ovl_too_many_candidates)
1209 << SuppressedOverloads;
1210}
1211
1212static void notePlausibleOverloads(Sema &S, SourceLocation Loc,
1213 const UnresolvedSetImpl &Overloads,
1214 bool (*IsPlausibleResult)(QualType)) {
1215 if (!IsPlausibleResult)
1216 return noteOverloads(S, Overloads, Loc);
1217
1218 UnresolvedSet<2> PlausibleOverloads;
1219 for (OverloadExpr::decls_iterator It = Overloads.begin(),
1220 DeclsEnd = Overloads.end(); It != DeclsEnd; ++It) {
1221 const FunctionDecl *OverloadDecl = cast<FunctionDecl>(*It);
1222 QualType OverloadResultTy = OverloadDecl->getResultType();
1223 if (IsPlausibleResult(OverloadResultTy))
1224 PlausibleOverloads.addDecl(It.getDecl());
1225 }
1226 noteOverloads(S, PlausibleOverloads, Loc);
1227}
1228
1229/// Determine whether the given expression can be called by just
1230/// putting parentheses after it. Notably, expressions with unary
1231/// operators can't be because the unary operator will start parsing
1232/// outside the call.
1233static bool IsCallableWithAppend(Expr *E) {
1234 E = E->IgnoreImplicit();
1235 return (!isa<CStyleCastExpr>(E) &&
1236 !isa<UnaryOperator>(E) &&
1237 !isa<BinaryOperator>(E) &&
1238 !isa<CXXOperatorCallExpr>(E));
1239}
1240
1241bool Sema::tryToRecoverWithCall(ExprResult &E, const PartialDiagnostic &PD,
1242 bool ForceComplain,
1243 bool (*IsPlausibleResult)(QualType)) {
1244 SourceLocation Loc = E.get()->getExprLoc();
1245 SourceRange Range = E.get()->getSourceRange();
1246
1247 QualType ZeroArgCallTy;
1248 UnresolvedSet<4> Overloads;
1249 if (isExprCallable(*E.get(), ZeroArgCallTy, Overloads) &&
1250 !ZeroArgCallTy.isNull() &&
1251 (!IsPlausibleResult || IsPlausibleResult(ZeroArgCallTy))) {
1252 // At this point, we know E is potentially callable with 0
1253 // arguments and that it returns something of a reasonable type,
1254 // so we can emit a fixit and carry on pretending that E was
1255 // actually a CallExpr.
1256 SourceLocation ParenInsertionLoc =
1257 PP.getLocForEndOfToken(Range.getEnd());
1258 Diag(Loc, PD)
1259 << /*zero-arg*/ 1 << Range
1260 << (IsCallableWithAppend(E.get())
1261 ? FixItHint::CreateInsertion(ParenInsertionLoc, "()")
1262 : FixItHint());
1263 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1264
1265 // FIXME: Try this before emitting the fixit, and suppress diagnostics
1266 // while doing so.
1267 E = ActOnCallExpr(0, E.take(), ParenInsertionLoc,
Benjamin Kramer5354e772012-08-23 23:38:35 +00001268 MultiExprArg(), ParenInsertionLoc.getLocWithOffset(1));
John McCall6dbba4f2011-10-11 23:14:30 +00001269 return true;
1270 }
1271
1272 if (!ForceComplain) return false;
1273
1274 Diag(Loc, PD) << /*not zero-arg*/ 0 << Range;
1275 notePlausibleOverloads(*this, Loc, Overloads, IsPlausibleResult);
1276 E = ExprError();
1277 return true;
Matt Beaumont-Gayc9366ba2011-05-04 22:10:40 +00001278}